Leila is the girl that everyone is in love with. Bert is in the same class as Amira, the little sister to Leila, and he sees his opportunity to approach Leila through friendship with Amira.

Lasse and Maja have had their detective agency shut down by the police chief when a customer ask for help to prove her father is innocent of the train robbery he was convicted of. Lasse and Maja now see their great chance to show off.